code: def test_bio_to_bioul(self):
      tag_sequence = [
          "B-ORG",
          "O",
          "B-MISC",
          "O",
          "B-MISC",
          "I-MISC",
          "I-MISC",
      ]
      bioul_sequence = span_utils.to_bioul(tag_sequence, encoding="BIO")
      assert bioul_sequence == [
          "U-ORG",
          "O",
          "U-MISC",
          "O",
          "B-MISC",
          "I-MISC",
          "L-MISC",
      ]
  
      # Encoding in IOB format should throw error with incorrect encoding.
      with self.assertRaises(span_utils.InvalidTagSequence):
          tag_sequence = [
              "O",
              "I-PER",
              "B-PER",
              "I-PER",
              "I-PER",
              "B-PER",
          ]
          bioul_sequence = span_utils.to_bioul(
              tag_sequence, encoding="BIO"
          )
  
file_path: magnitude/pymagnitude/third_party/allennlp/tests/data/dataset_readers/dataset_utils/span_utils_test.py
imports: from __future__ import with_statement
  from __future__ import absolute_import
  from allennlp.common.testing import AllenNlpTestCase
  from allennlp.data.dataset_readers.dataset_utils import span_utils
  from allennlp.data.tokenizers.word_tokenizer import SpacyWordSplitter
  from allennlp.data.tokenizers.token import Token
label_desc: Use image node_id 10 for calling the SpanUtilsTest obj's underlying member method code with example usage: obj.test_bio_to_bioul() without return types